7121289 has 16 divisors (see below), whose sum is σ = 11202560. Its totient is φ = 3937680.

The previous prime is 7121267. The next prime is 7121321. The reversal of 7121289 is 9821217.

It is not a de Polignac number, because 7121289 - 2⁷ = 7121161 is a prime.

It is a Duffinian number.

7121289 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7121209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4819 + ... + 6120.

It is an arithmetic number, because the mean of its divisors is an integer number (700160).

Almost surely, 2^7121289 is an apocalyptic number.

It is an amenable number.

7121289 is a deficient number, since it is larger than the sum of its proper divisors (4081271).

7121289 is a wasteful number, since it uses less digits than its factorization.

7121289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10980.

The product of its digits is 2016, while the sum is 30.

The square root of 7121289 is about 2668.5743384811. The cubic root of 7121289 is about 192.3916430716.

The spelling of 7121289 in words is "seven million, one hundred twenty-one thousand, two hundred eighty-nine".